7\
m
O
O a
144/220 MHz FM MULTI BANDER
TM-641A
144/440 MHz FM MULTI BANDER
TM-741A
144/430 MHz FM MULTI BANDER
TM-741A
144/430 MHz FM MULTI BANDER
TM-741E
INSTRUCTION MANUAL
KENWOOD CORPORATION
©PRINTED IN JAPAN B62-0082-10(K)(T)
92/12 11 10 9 8 7 6 5 4 3 2 1 91/12 11 10 9 8 7 6
Thank you for purchasing this new transceiver.
IMPORTANT:
Please read this instruction manual carefully before placing your transceiver in service.
CAUTION;
Long transmission or extended operation in the HI power mode might cause the rear of this transceiver to get warm.
Do not place the transceiver where the heat sink (rear panel) might come in contact with plastic or vinyl surfaces.
This instruction Manual covers the following models.
TM-641A: |
144/220MHZ FM MULTI BANDER |
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(U.S.A.version) |
TM-741A: |
144/440MHZ FM MULTI BANDER |
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(U.S.A. and Canadian version) |
TM-741A: |
144/430MHZ FM MULTI BANDER |
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(General markets) |
TM-741E: |
144/430MHZ FM MULTI BANDER |
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(European markets) |
NOTE: |
If disregarded, inconvenience only, no |
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risk of equipment damage or personal |
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injury. |
CAUTION: |
Equipment damage may occur, but not |
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personal injury. |
Save this instruction manual.
Illustrations show the TM-741A.
FCC WARNING
This equipment generates or uses radio frequency energy. Changes or modifications to this equipment may cause harmful interference unless the modifications are expressly approved in the instruction manual. The user could lose the authority to operate this equipment if an unauthorized change or modification is made.
CONTENTS |
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1. |
BEFORE OPERATION ......................................... |
5 |
2. |
SPECIFICATIONS and ACCESSORIES .............. |
6 |
3. |
INSTALLATION INSTRUCTIONS...................... |
8 |
4. |
OPERATION ....................................................... |
12 |
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4-1 OPERATING CONTROLS............................... |
12 |
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Front Panel ................................................... |
12 |
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Microphone .................................................. |
16 |
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Display Panel ............................................... |
18 |
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Rear Panel and Side case ............................. |
20 |
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4-2 RECEIVER OPERATION................................ |
21 |
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Receiver Operation ...................................... |
21 |
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Frequency Selection .................................... |
22 |
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Frequency Step Selection ............................ |
22 |
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ProgrammableVFO Tuning Limits ... |
23 |
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A.B.C.(Automatic Band Change) ................ |
24 |
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Band Selection ............................................. |
25 |
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Attenuator ON/OFF ..................................... |
25 |
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ALT (Automatic Lock Tuning) ................... |
26 |
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4-3 TRANSMITTER OPERATION........................ |
27 |
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Transmission ............................................... |
27 |
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TX Alert ....................................................... |
27 |
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Time-Out Timer (TOT) ............................... |
28 |
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Bandwidth Selection .................................... |
28 |
4-4 MEMORY ......................................................... |
29 |
.Microprocessor Memory Back-up ............. |
29 |
Microprocessor Initialization ...................... |
29 |
Memory Channels ....................................... |
30 |
Memory Contents ........................................ |
30 |
Memory Entry ............................................. |
31 |
Memory Channel Recall ............................. |
32 |
Memory Banks ........................................... |
32 |
Clearing Memory ........................................ |
35 |
.Memory Shift ............................................. |
35 |
4-5 SCAN ................................................................ |
36 |
Scan Options ............................................... |
36 |
Hold/Resume Programming ........................ |
36 |
Band Scan ................................................... |
37 |
Programmable Band Scan ........................... |
38 |
.MHz Scan ................................................... |
38 |
Memory Channel Scan ................................ |
38 |
CALL Scan .................................................. |
39 |
V/M/CScan .................................................. |
39 |
Automatic Memory Scan ............................ |
39 |
.Memory Channel Lockout ......................... |
40 |
4-6 REPEATER OPERATION............................... |
41 |
Transmitter Offset ....................................... |
41 |
Reverse Function ........................................ |
41 |
Tone and CTCSS Operation ....................... |
41 |
Autopatch Operations ................................. |
43 |
4-7 |
DTSS .............................................................. |
44 |
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DTSS Code .................................................. |
44 |
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DTSS Code Selection .................................. |
44 |
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Using the DTSS Function ............................ |
45 |
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Using DTSS with a Repeater ....................... |
45 |
4-8 |
PAGING ......................................................... |
46 |
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Paging Code Memories ............................... |
47 |
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Code Selection ............................................. |
47 |
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Code Transmission ...................................... |
48 |
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Paging Code Monitoring ............................. |
49 |
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Code Lockout .............................................. |
50 |
4 - 9 TONE ALERT SYSTEM................................ |
51 |
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4-10 AUTOMATIC POWER OFF (APO)............. |
52 |
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4-11 DIMMER (DIM) ............................................ |
52 |
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4-12 BEEP TONE LEVEL ADJUSTMENT.... |
53 |
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4-13 BEEP TONE FREQUENCIES ....................... |
53 |
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4- |
14KEYLOCKS ................................................... |
54 |
5. CLOCK ................................................................ |
55 |
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5 -1 CURRENT TIME AND DATE...................... |
55 |
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Backup Switch.............................................. |
55 |
5- |
Setting the Current Time and Date .............. |
55 |
2 OTHER CLOCK FUNCTIONS ..................... |
56 |
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Current Time, Calender and Stopwatch in the |
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Clock display ............................................... |
56 |
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Time-ON/Time-OFF Programming............. |
57 |
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Activating the SLEEP Timer........................ |
57 |
5 - 3 CLOCK POSITION ON THE FREQUENCY |
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DISPLAY ...................................................... |
58 |
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Transceiver Function ON or OFF............... |
58 |
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Transceiver Function OFF........................... |
58 |
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Transceiver Function ON............................. |
59 |
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Tri-Bander ................................................... |
59 |
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Clock Operation in the Frequency Display 60 |
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6. |
MAINTENANCE ................................................ |
61 |
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In Case of Difficulty .................................... |
62 |
7. |
OPTIONAL ACCESSORIES .............................. |
64 |
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CTCSS unit (TSU-7) |
65 |
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DTMF unit (DTU-2) |
65 |
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Panel Separation Kit (PG-4K^ PG-4L) 68 |
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Bracket ........................................................ |
70 |
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Band Unit ................................................... |
71 |
BLOCK DIAGRAM and SCHEMATIC DIAGRAM |
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........................................ another sheet |
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NOTICE
One additional band may be installed using options described in this manual. Operation instructions remain the same for the radio when uses a dual band or tri-band configuration.
1.BEFORE OPERATION
To prevent electric shock, fire and other injury, please note the following:
Never remove the case unless instructed to do in this Instruction Manual. If the internal parts are touched accidentally, a serious electric shock might occur.
Do not place this unit where it will be exposed to direct sunlight or close to heating appliances.
Do not place anything on top of the cabinet.
To ensure good ventilation, do not put anything on top of the cabinet and allow at least 15 cm (6 inches) of space behind the unit.
Do not place the unit in areas of excessive dust, high humidity or on unstable surfaces.
Do not drop pieces of metal, needles, coins and other electrically conductive materials into the unit.
Do not touch the power plug, when your hands are wet.
If an abnormal odor or smoke is detected, immediately turn the power off. Contact the KENWOOD service station or your dealer.
Cleaning
1.Turn the power off before cleaning the unit.
2.Do not use any type of abrasive pad, thinner, benzine or any substances which may damage the unit.
3.Wipe the front panel and other exterior surfaces of the unit with a soft dry cloth or a soft cloth lightly moistened with water.
The power requirement is 13.8 VDC.
Never attempt connection to a 24 VDC source.
2. |
SPECIFICATIONS and ACCESSORIES |
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2-1. SPECIFICATIONS |
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144 MHz Band |
220 MHz Band |
440/430 MHz Band |
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Frequency |
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U.S. A and Canada |
144 ~148 |
220 ~225 |
438 ~450 |
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Other market |
144 ~148 |
— |
430 ~440 |
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range MHz |
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G |
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TM-741E |
144 ~146 |
— |
430 ~440 |
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E |
Mode |
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F3E(FM) |
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N |
Antenna impedance |
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50D |
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E |
Operating temperature |
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-20'C~+60X (-4T~ +140°F) |
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R |
Power requirements |
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13.8VDC±15% (11.7~15.8V) |
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A |
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Ground |
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N^ative |
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L |
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Current drain |
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Transmit mode |
Less than 11.5A |
Less than 7.0A |
Less than lO.OA |
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Receiver mode |
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Less than 1.2A |
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Frequency stability |
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±10ppm |
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Dimensions (WXHXD) |
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150X50X175 mm |
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Wa^ |
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1.6 kg |
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T |
Output |
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HI |
50W |
25W |
35W |
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R |
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MID |
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low |
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power |
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A |
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N |
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LOW |
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Approx. 5W |
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S |
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Modulation |
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Reactance modulation |
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M |
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I |
Spurious radiation |
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Less than —60dB |
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T |
Maximum frequoxy cfeviation |
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±5kHz |
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T |
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E |
Audio distortion (at 60% modulation) |
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Less than 3% |
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R |
Microphone impedance |
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6oon |
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144 MHz Band |
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220 MHz Band |
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440/430 MHz Band |
R |
Circuitry |
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Double conversion superheterodyne |
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E |
Intermediate frequency lst/2nd |
10.7 MHz/455 kHz |
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30.825 MHz/455 kHz |
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21.6 MHz/455 kHz |
Sensitivity (12 dB SIN AD) |
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Less tJian0.16;[/V (—10 dB/z) ^ |
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C |
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Selectivity —6 dB |
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More than 12 kHz |
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E |
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I |
Selectivity —60 dB |
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Less than 24 kHz |
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V |
Squelch sensitivity |
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Less than 0.1 /¿V (—14dB//) |
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E |
Output (5% distortion) |
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More than 2 W (8D load )(5% distortion) |
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R |
External speaker impedance |
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8D |
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NOTE: 1. Circuit and ratings are subject to change without notice, due to developments in technology. 2. Recommended duty-cycle: 1 minute Transmission, 3 minutes Receptioa
2-2. ACCESSORIES
Unpack your transceiver carefully and confirm that the accessories listed below are included in the box.
DTMF Microphone ................. |
T91-0397-XX ............ |
1 |
( U.S.A. and Canada only) |
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or Microphone.......................... |
T91-0398-XX ............ |
1 |
(European version) |
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or Microphone.......................... |
T91-0396-XX ............ |
1 |
(General market) |
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Microphone Hook..................... |
J20-0319-XX |
1 |
( U.S.A. and Canada only) |
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Mobile Mounting Kit.................................................... |
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1 |
Bracket.......................... |
J29-0454-XX |
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Screw set ....................... |
N99-0331-XX |
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Self tapping Screw................... |
N46-3010-46 ............ |
2 |
(U.S.A. and Canada only) |
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Hex Wrench ............................ |
W01-0414-XX . . . |
. 1 |
DC power Cable ...................... |
E30-3034-XX |
. . . . 1 |
FusedSA) ................................. |
F05-1531-XX |
. . . . 1 |
Instruction Manual .................. |
B62-0082-XX |
1copy |
Quick reference ....................... |
B59-0441- x x |
1 copy |
Warning sheet ......................... |
B58-1001-XX |
1 copy |
Warranty Card (U.S.A., Canada and European version |
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only) ............................................................................ |
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1 |
After unpacking |
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Shipping container: Save the boxes and packing in the |
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event your unit needs to be transported for remote |
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operation, maintenance, or service. |
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3. INSTALLATION INSTRUCTIONS
3-1. INSTALLATION
3-1-1. Installing the Microphone and Setting the Clock Backup Switch
Before installing be sure to turn off the power switch.
1.Slide the release button on the front panel to the right. Carefully pull the front panel toward you from the right, then remove the whole panel unit. Be careful with the cord connecting the front panel unit to the chassis. (Fig. 1)
2.Insert the microphone connector into the microphone socket on the right of the main unit until it clicks. Make sure the tab on the connector is on top.
3.Place the microphone cord in the holder groove. (Fig. 2)
■BACKUP SWITCH
Inside the small cover of the front panel unit there is a Backup Switch to retain clock memory. If you set the switch ON »turning off the POWER switch, disconnecting the power cable or an intermittent power failure will not erase the clock memories.
4.Slide the small cover off of the front panel unit as shown in the accompaning illustration. (Fig.3)
5.Gently lift up on the cable near the grommet.
6.Set the Backup switch ON. Pay attention to the labelings.
7.Push the grommet down into its slot.
8.Replace the small cover until it clicks.
9.Route the cable as desired
in the slots on the rear of |
1 ^ |
[ |
the front panel. |
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1%--------- ) |
10.Align the hook on the back of the front panel with the slot on the left of the chassis before replacing the front panel.
11.Push the front panel toward the chassis until it locks completely. Take care not to trap the connecting cord.
The connecting cord is easier to manage when it is put in the groove on the back of the front panel.
12.Set the date and time ( See page 55 ).
(Fig. 1) |
microphone |
slot |
(Fig. 2) |
connector |
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holder
release button
8 |
(Fig. 3) |
3-1-2. Mounting Bracket
Notes
1.When installing the transceiver in a vehicle consider ease of operation and safety when selecting the location for the mounting bracket.
2.Install the bracket securely so that it will not come off due to vibration.
1.Install the bracket using the supplied flat washers and self tapping screws (4 pcs. each).
2.Attach the transceiver loosely using the SEMS screws (4 pcs.).
3. Adjust the viewing angle of the bracket to the desired position.
Hold the transceiver in place and tighten the 4 SEMS screws using the supplied wrench.
3-2. CONNECTION
3-2-1. Antenna
The type of antenna that is used will greatly affect the performance of the transceiver. Use a properly adjusted antenna, of good quality, to enable your transceiver to perform at its best. The antenna input impedance is 50 ohms. Use 50-ohm coaxial cable such as RG-8U or 8D2V for this connection. If the antenna is far from the transceiver the use of low loss coaxial cable, such as RG8U is recommended. Match the impedance of the coaxial cable and that of the antenna so that the SWR is less than 1.5 to 1. The protection circuit in the transceiver will activate if the SWR is particularly poor (greater than 3 to 1).
High SWR values will cause the transmitter output to drop, and may lead to TVI or BCI reports.
Caution;
We recommend that you install a high quality lightning arrestor in your antenna lines for protection against fire,electric shock,personal injury,or damage to the radio itself.
3-2-2. Mobile Installations
Cautions
1.Before installing the power cable, be sure to remove the negative lead from the battery for safety.
2.After installation and wiring, be sure to double check for correct installation before reconnecting the negative lead to the battery terminal.
3.If the fuse opens, be sure to check that each conductor has not been damaged by short circuiting, etc. Then replace with a new fuse of the same rating.
4.After completing the wiring, wrap the fuse holder with heat resistant tape to protect against heat and moisture.
5.Do not remove the fuse even if the power cable is too long.
Make sure the positive (+) and negative (—) lead polarity is correct when connecting to the battery.
Engine compartment-——-Passenger compartment
Red Fuse |
0 |
f |
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To the |
\transceiver
the
hole. |
From passenger |
j£ |
compartment |
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Thread like this |
Battery Connections
Caution
Leave enough space around the fan on the rear panel for good ventilation.
Connect the power cable directly to the battery terminals. Use of the cigarette lighter socket will lead to poor connection, and will result in poor performance. Pay close attention to the polarity of the cables when connecting them to the battery.
10
3-2-3. Fixed Station
A regulated DC power supply (13.8 VDC capable of supplying at least 12 Amperes) is required. The PS-430 and the PS-50 are recommended.
Caution:
1.Never connect the AC power cable to the AC outlet until all other connections have been made.
2.Before connecting and disconnecting the power connector, be sure to turn OFF the POWER switches of both the transceiver and the DC power supply.
3.Observe polarity of the DC power cable. The transceiver operates on 13.8 VDC, negative ground. Battery polarity must be correct. The power cable is color coded :
Red |
+ (Positive polarity) |
Black |
— (Negative polarity) |
Caution:
Leave enough space around the fan on the rear panel for good ventilation.
11
12
When optional band unit is installed.
CONTROL SEITECT keys (Press) / Current Operating Band indicators
These keys are used to select the key operating band.(To change the transmission band, use the BAND SELECT key.)
The green light shows which band will be controlled by the front panel controls.
SQL (Squelch) controls
These controls are used to separately adjust each squelch threshold level.
BAND SELECT keys (Press) / VOL controls {Rotate)
These keys are used to select the transmit band. They are also used to select the band you wish to control with the front panel switches. When a key is pressed the ”PTT” indicator will flash as a visual signal to show which band has been selected.
VOL controls (Rotate)
These controls are used to adjust the volume.
13
14
I Function key Assignments
Press the F key for longer than 1 second so that the key indicator begins to flash, then press the key below.
Key |
Function |
Refer to |
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F 1 Sec, |
VFO |
Change Scan Hold/ |
P.36 |
4-5-2 |
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Resume mode |
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F 1 Sec, |
MR |
Memory channel lockout |
P.40 4-5-10 |
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F1 Sec, |
MHz |
Automatic Power off functior |
P.52 |
4-10 |
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will turn on or off |
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F 1 Sec, |
CALL |
The lower limit of the |
P.23 |
4-2-4 |
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programmable VFO |
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F 1 Sec, |
SHIFT |
The upper limit of the |
P.23 |
4-2-4 |
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programmable VFO |
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F 1 Sec, |
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Tone frequency selection |
P.42 |
4-6-3 |
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TONE |
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F 1 Sec, |
REV |
Beep tone level adjustment |
P.53 |
4-12 |
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F 1 Sec, |
DTSS |
DTSS code selection |
P.44 |
4-7-2 |
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F 1 Sec, |
LOW |
Time-out timer on or off |
P.28 |
4-3-3 |
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F 1 Sec, |
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Select receive detection |
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output band from the |
P.18 |
4-1 |
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CONT SEL |
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microphone connector |
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F 1 Sec, |
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Band on or off |
P.25 |
4-2-6 |
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BANDSEL |
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• Press and hold the F key, then the key |
DClow. |
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Key |
Function |
Refer to |
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F+ VFO |
Enter the programmable scan |
P.38 4-5-4 |
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lower frequency limit |
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F+ MHz |
Enter the programmable scan |
P.38 4-5-4 |
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upper frequency limit |
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F+ MR |
Clear the displayed memory |
P.35 4-4-8 |
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channel data |
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F+ TONE |
Bank status display |
P.32 4-4-7 |
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F+ DTSS |
DTSS delay time selection |
P.45 4-7-4 |
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F+ LOW |
Memory consolidation |
P.32 4-4-7 |
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F+ |
Automatic Memory scan |
P.39 4-5-9 |
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CONT SEL |
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F+ |
Clear Memory Bank |
P.35 4-4-8 |
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BAND SEL |
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F+ PIT |
TX Alert |
P.27 4-3-2 |
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•Press and hold the key below and turn on the power switch.
Key |
Function |
Refer to |
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MR + |
Memory reset of all bands |
P.29 4-4-2 |
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Power ON |
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F+BANDSEL |
Memory reset of a band |
P.29 4-4-2 |
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+ Power ON |
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15
Key |
Function |
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Refer to |
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VFO+ |
VFO reset of all bands |
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P.30 4-4-2 |
Power ON |
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VFO-i-BANDSEL |
VFO reset of a band |
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P.30 4-4-2 |
-I- Power ON |
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MHz+ |
All lock on or off during Lock |
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P.54 4-14 |
Power ON |
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CALL+ |
Demonstoration mode |
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P.40 |
Power ON |
on or off |
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F+SHIFT+ |
Tone alert selection |
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P.51 4-9 |
Power ON |
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F+TONE+ |
Set the time and date |
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P.55 5-1-2 |
Power ON |
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With optional DTU-2: |
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F+DTSS+ |
The microphone PF key can |
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P.66 7-3-1 |
Power ON |
be used to change the beep |
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tone frequency. |
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F-I-LOW + |
Wide /Narrow selection |
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P.28 4-3-4 |
Power ON |
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4-1-2. Microphone
(2) ®
®d)UP/DWN switches
These switches can be used to increase or decrease the VFO frequency, the Memory channel number, and the Tone frequency, etc..
d)PTT (Push to Talk) switch
The transceiver will transmit whenever this switch is depressed. Scan operations may be canceled by pressing this switch without transmitting.
0LOCK switch
This key will deactivate all functions of the microphone except the PTT function and DTMF keypad.
(Dl6-Tone DTMF keypad
These buttons are used to activate the DTMF encoder.
16
(DPF(Programmable Function) key
This key can be programmed to perform any of the following functions: BAND SEL (*^) key (Initial setting from the factory); or MHz, T.ALT, TONE, REV, DTSS, LOW, MUTE, or CONT SEL (^) key.
To program the key use the following procedure:
1.Turn off the POWER switch on the transceiver.
2.Press and hold the key on the front panel of the set that corresponds with the function you wish to program the microphone key to perform.
3.Turn on the POWER switch while the key on the front panel is held in.
4.Release the front panel key.
(^) Press the PF key set in the CONT SEL or BAND SEL key to cause the radio to switch from a band to the other. Pressing the PF key for longer than 1 second will not initiate scanning
Press the PF key set in the CONT SEL or BAND SEL key to cause the radio to switch from one band to the other. Pressing the PF key for longer than 1 second will not initiate scanning.
One additional function can be programmed that is not included on the front panel of the transceiver. This is known as the MONITOR function. This will allow you to open squelch of the selected band to check the band for a clear frequency. This will function even if you are operating in the CTCSS decode mode.
MONITOR programming
Press and hold the F key on the front panel as you turn on the POWER switch of the transceiver and then release the F key.
(2X:ALL key VFO key MR key
These keys function are like the CALL, VFO,or MR key on the front of the radio. (See page 12.and page 14) These keys can be programmed to function as the PF key.
To program the key :
1.Turn off the POWER switch on the transceiver.
2.Press and hold one of these keys.
3.Turn on the POWER switch. The PF-2/3/4 will appear in the display.
4.Press the key on the front panel that you wish to program the microphone key.
5.Release the microphone key.
To release the programming reset the VFO.
(saSffflSs issBBRBs IBBBBBBS^ i B B n i I I
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Turn on |
Press and hold MR key............................... |
PF2 |
MR key.............................. |
PF3 |
MR key.............................. |
PF4 |
(Dl750key (European version)
The transceiver will transmitt with 1750 Hz repeater access tone whenever this switch is depressed.
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►Microphone terminal connection
(Front view)
Receive audio for the selected TX band (100mV/l0kn)
Receive Audio Output Band Selection (RD) connector
The RD terminal will supply an audio signal during receive on the same band that has been selected for transmit. Press the F key for longer than 1 second, and then press the CONT SEL key for the desired band. An indicator will appear in the frequency display of the selected band.
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Receive Audio output display
The 100 kHz dot in the band lights
4-1-3. Display Panel
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LLCfO U.U:U.U |
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Indicates the TX band. |
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Displays the selected transmitter offset |
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With the optional CTCSS unit TSU-7: On |
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active. |
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On when the DTSS function is active. )CO On when Carrier Operated scan is
selected.
On when the Tone Alert function is active.
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^188
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* B 8
P B
L M
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CTCSS CO |
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CTCSS CO |
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CTCSS CO m ON |
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REV |
DTSS ^ |
SO. |
REV |
DTSS ^ |
SO |
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*88 'Ш“!!1Ч“Ч!ШSI *88 |ИРдаччч<ШSI *88 в»'Ш!Ш|Ш!SI |
A.B.C |
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MUTE |
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Displays the operating frequency to the |
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1200MHz band only; On when the Automatic |
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• The indicator flashes when scanning. |
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28/50 MHz band only; On when Attenuator is |
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On when the TIME ON/OFF function has |
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depressed. |
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SLEEP |
On when the SLEEP TIMER function has |
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that was selected. The indicator is on © LOCK |
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during Memory channel scan. |
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A,LOCK |
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activated. |
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-On when the squelch opens. |
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APO |
On when the Automatic Power Off |
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receiver signal strength or the |
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TOT |
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transmitter power output. |
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On when the Automatic Band Change |
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setting for transmit. No indicator |
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reduced. |
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4-1-4. Rear Panel and Side Case
144MHz.
TM-741A/741E- 440/430MHZ
TM-641A 220MHz
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w
(DANTENNA connector
Attach an antenna with a low SWR and impedance of 50 ohms.
(2) 13.8 VDC power input connector
Connect the supplied DC power cable to this connector. Pay close attention to the polarity. Red is positive and black is negative.
(DFuse holder
Contains a 15A fuse. Do not use a larger fuse as damage might result to the transceiver.
(3) External speaker jack (Rear panel)
The speaker should have an impedance of 8 ohms.
The audio is switched to the external speaker (no sound is output from the built-in transceiver speaker).
(5)External speaker jack (Side case)
The speaker should have an impedance of 8 ohms. The audio is switched from the built-in transceiver
speaker to the external speaker (no sound is output from the built-in transceiver speaker).
Example
We recommend the use of the optional external speaker SP-50B.
20
Fig.l
2. Turn on the Power Supply, then turn on the transceiver’s POWER switch. The display should light after 1 second. Fig.l shows examples of frequencies that will appear on the various models. The frequencies shown above are the default frequencies after a microprocessor reset. If the display shows incomplete data or you think the displayed frequency is in error you should reset the microprocessor. ( Memory Initialization on page 29 )
Perform the following steps for each band.
so that the operating band indicator lights (green). Rotate the VOL control clockwise until a signal or noise is heard coming from the speaker.
4.Rotate the tuning control or press the microphone UP/DWN switches to select an open channel.
5.Rotate the SQL control clockwise until the noise just disappears and the BUSY indicator turns off. This point is known as the Squelch Threshold point.
6.Select the desired operating frequency using the microphone or tuning control. When a signal is received the S-meter will deflect and the BUSY indicator will turn on.
21
7. Turn off the transceiver’s Power switch before you turn off the power supply, or in a vehicle, before you stop the engine.
4-2-2. Frequency Selection
You can change the dial frequency while in the VFO mode. The frequency can also be stored in memory, or in the call channel.
1.Press the VFO key to select the VFO mode.
2.Rotate the tuning control, or press the microphone UP/DWN switches to select the desired frequency.
Mode selection
You can select the VFO mode. Memory channel mode, or Call channel mode using the following keys.
4-2-3. Frequency Step Selection
T0 select the desired tuning or scan step size use the following procedure:
1.Press the VFO key to select the VFO mode.
2.Press the F key momentarily. The F indicator should light on the display.
3.Press the REV/STEP key within 10 seconds of pressing the F key. The current frequency step size will be displayed.
4.Rotate the Tuning control or press the microphone UP/DWN keys until the desired tuning step size appears in the display.
C S )
tons 5,1,. n o n n
G E )
step Size [kHz]
5^10^15?i20?=i12.5=i25i*
5. To complete the programming of the step size you can press any front panel key or simply wait 10 seconds and the microprocessor will automatically return to the normal frequency display.
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The chart below illustrates the way the displayed frequency will change when you change from one step size to another.
5,10,15,20 to 12.5,25
0,5,10,15 |
0 |
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20,25,30,35 |
25 |
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12.5,25 to 5,10,15,20
0 |
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12.5 |
10 |
25 |
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37.5 |
30 |
50 |
50 |
62.5 |
60 |
75 |
70 |
87.5 |
80 |
For example:
Assume you are presently displaying a frequency of 439.920 MHz and had previously selected a 20 kHz step size. If you were to change the step size to 12.5 kHz the display would then read 439.925 MHz.
4-2-4. Programmable VFO Tuning Limits
The radio provides the capability of programming the VFO tuning range, in 1 MHz band segments, as well a providing a separate programmable band scan function. (See section 4-5.) For example, you could tell the transceiver that you only wish to tune the 438.000 MHz and 439.000 MHz band segment by specifying any frequency with these two segments. The Tuning controls would then only tune within these specific bands. The procedure for specifying the bands is described below.
1.Press the VFO key to select the VFO mode. Rotate the Tuning control until the desired lower tuning range appears on the frequency display.
For example, you might want to select the 438 MHz band and dial up 438.100 MHz.
2.Press the F key,for longer than 1 second, then press the CALL key.
more than |
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^unnn |
inn |
1 sec |
iW i . u u u ' < 3 0 |
. l u u |
3.Rotate the Tuning control until the desired upper tuning range appears on the frequency display. Press the F key for longer than 1 second, then press the SHIFT key.
d j r
lore than |
IriuC ^unnn |
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mn |
1 sec |
l u i D H I . U U U |
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(^3HIFT^
5.To confirm that the programming was properly performed rotate the Tuning control.
The transceiver should not go above or below the programmed band limits.
23
To clear both programmed limits simultaneously, turn the Power off ,then;
ALL BAND mode
Press and hold the VFO key, then turn the Power switch on (VFO RESET See page 30).
INDIVIDUAL BAND mode
Press and hold the VFO key and the BAND SEL key for the band you want to clear, then turn the Power switch on.
You can reprogram either limit independently by fol lowing the appropriate instructions above.
4-2-5. A.B.C.(Automatic Band Change)
The A.B.C function allows you to exchange the RX band to the TX band automatically whenever a signal is received and the squelch is open.
1. Press the F key and then press the MUTE/ABC key. The A.B.C. indicator will light on the display.
( J j
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' ^ . u n n n . , . , n n n n |
A.B.C. |
l U l D I H i . u u u ' i H u . u u u |
(^MUTE^
2.As soon as a signal is received on any band, the TX circuit will become active on that band.
(
, ^ u n n n f f ^ . n n n n l O H S I ' i l . U U U Wu . uuu
3.
If you press the PTT switch,
The A.B.C. function will be released. The band remains TX band.
If the PTT switch is not pressed,
Within 2 seconds after the signal goes off, the band will be returned to RX band.
If you press the BAND SEL key.
The A.B.C function will be released.
24
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